Question about Pentair MINIMAX NT TSI IGNITER

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Pentair Mini-Max NT Pool Heater does not get very hot

The heater has worked great until tonight. I normally set the temperature to 98 degrees and it's quite hot. Tonight I had to set it to 104 degrees and it was warm but not hot. The heater is about 4 years old and has never had a problem before, nor has it had any maintenance. Is there a thermocouple or something easy to fix? Also, is there a repair guide I could purchase or download?

Thanks,

Ed

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The thermistor is a common failure on this heater. With a setting of 104 and the heater shutting off early, the sensor is bad. If you have a digital display, check the water temp with a thermometer and compare that ot the display. Odds are that they are different. The thermistor plugs into the back of the thermostat board and is a thin whire wire set or thibker yellow wire. The white wire sensors are old and most have fialed by now.

Posted on Dec 21, 2008

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